What is the genus of the sunflower?

Fill in the blanks $A$ and $B$ in the following taxonomic hierarchy:
Kingdom $\rightarrow$ Phylum $\rightarrow$ $[A]$ $\rightarrow$ Order $\rightarrow$ $[B]$

Match column-$I$ (Biological name) with column-$II$ (Class) and choose the correct option.

Column-$I$ (Biological name)	Column-$II$ (Class)
$A$. Homo sapiens	$I$. Dicotyledonae
$B$. Musca domestica	$II$. Mammalia
$C$. Mangifera indica	$III$. Monocotyledonae
$D$. Triticum aestivum	$IV$. Insecta

Give an example of a taxonomic category hierarchy.

Which of the following options represents the correct sequence of taxonomic categories based on increasing similarity of characteristics?

Genus represents